1 PHRASAL VERB 偷偷地走近;偷偷地挨近 If someone sneaks up on you, they try and approach you without being seen or heard, perhaps to surprise you or do you harm. 偷偷地走近;偷偷地挨近
2 PHRASAL VERB 突然降临;出其不意地发生 If something sneaks up on you, it happens or occurs when you are not expecting it. 突然降临;出其不意地发生